Inlet or outlet
connection for
padding, purging
or venting.
Drain plug
Inlet or outlet
connection for
water jacket.
Inlet or outlet
connection for
padding, purging
or venting.
Inlet or outlet
connection for
water jacket.
Water jackets
Distance piece
Upper V-ring
packing set
Lower V-ring
packing set
Upper V-ring
packing set
Lower V-ring
packing set
Oil deflector ring
Oil deflector ring
Piston rod
Piston rod
Packing adjusting
screw
Packing adjusting
screw
codes and regulations should be checked for specific relief
valve requirements. Also, relief valves may be required at
other points in the compressor’s system piping.
1.8 Shutdown/Alarm Devices
For many applications, shutdown/alarm switches will
provide worthwhile protection that may prevent serious
damage to your compressor system. All electronic
devices should be selected to meet local code
requirements. Shutdown/alarm devices typically used on
Corken compressors are as follows:
1.
Low Oil Pressure Switch:
Shuts down the unit if
crankcase oil pressure falls below 12 psi due to oil
pump failure or low oil level in crankcase. The switch
or the compressor controller must have a 30 second
delay on startup which allows the compressor to build
oil pressure in the crankcase.
2.
High Discharge Temperature Switch:
This switch
Figure 1.6: Model WFD551 distance piece details.
is strongly recommended for all applications. Both
the High Discharge Temperature switch (HDT) and
compressor have an operating pressure range. It is
preferable that the switch set point be midpoint in its
range and 30°F (-1°C) above the normal discharge
temperature, but below the maximum design
temperature for the compressor of 350°F (176°C).
3.
Low Suction Pressure Switch:
Shuts down the
unit if inlet pressure is not within the preset limit (set
point). In some cases, it is important not to pull a
vacuum because of the potential of pulling oil from the
crankcase into the gas stream.
4.
High Discharge Pressure Switch:
Shuts down the
unit if the outlet pressure reaches a preset limit (set
point). Both the switch and the compressor have an
operating range. The set point of the pressure switch
should be as follows:
Greater than the normal operating pressure for the
compressor.
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